Question 1

3, 5, 11, 14, 17, 21

Accepted Answer

Each of the numbers except 14 is an odd number. The number '14' is the only EVEN number.

Question 2

8, 27, 64, 100, 125, 216, 343

Accepted Answer

The pattern is 2 3, 3 3, 4 3, 5 3, 6 3, 7 3. But, 100 is not a perfect cube.

Question 3

10, 25, 45, 54, 60, 75, 80

Accepted Answer

Each of the numbers except 54 is multiple of 5.

Question 4

396, 462, 572, 427, 671, 264

Accepted Answer

In each number except 427, the middle digit is the sum of other two.

Question 5

6, 9, 15, 21, 24, 28, 30

Accepted Answer

Each of the numbers except 28, is a multiple of 3.

Question 6

1, 4, 9, 16, 23, 25, 36

Accepted Answer

Each of the numbers except 23, is perfect square.

Question 7

1, 4, 9, 16, 20, 36, 49

Accepted Answer

The pattern is 1 2, 2 2, 3 2, 4 2, 5 2, 6 2, 7 2. But, instead of 5 2, it is 20 which to be turned out.

Question 8

2, 5, 10, 17, 26, 37, 50, 64

Accepted Answer

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1 But, 64 is out of pattern.

Question 9

10, 14, 16, 18, 21, 24, 26

Accepted Answer

Each of the numbers except 21 is an even number.

Question 10

16, 25, 36, 72, 144, 196, 225

Accepted Answer

Each of the numbers except 72 is a perfect square.

Question 11

331, 482, 551, 263, 383, 362, 284

Accepted Answer

In each number except 383, the product of first and third digits is the middle one.

Question 12

835, 734, 642, 751, 853, 981, 532

Accepted Answer

In each number except 751, the difference of third and first digit is the middle one.

Question 13

41, 43, 47, 53, 61, 71, 73, 81

Accepted Answer

Each of the numbers except 81 is a prime number.

Question 14

3, 5, 7, 12, 17, 19

Accepted Answer

Each of the numbers is a prime number except 12.

Question 15

582, 605, 588, 611, 634, 617, 600

Accepted Answer

Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.

Question 16

22, 33, 66, 99, 121, 279, 594

Accepted Answer

Each of the number except 279 is a multiple of 11.

Question 17

8, 13, 21, 32, 47, 63, 83

Accepted Answer

Go on adding 5, 8, 11, 14, 17, 20. So, the number 47 is wrong and must be replaced by 46.

Question 18

1, 8, 27, 64, 124, 216, 343

Accepted Answer

The numbers are 1 3, 2 3, 3 3, 4 3 etc. So, 124 is wrong; it must have been 5 3 i.e., 125.

Question 19

1, 2, 6, 15, 31, 56, 91

Accepted Answer

1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92 Last number of given series must be 92 not 91.

Question 20

52, 51, 48, 43, 34, 27, 16

Accepted Answer

Subtract 1, 3, 5, 7, 9, 11 from successive numbers. So, 34 is wrong.

Odd Man Out and Series Questions